00:01
To determine how much potassium sulfide reacted, we first need a balanced chemical reaction.
00:05
The reaction is hydrochloric acid with potassium sulfide, producing hydrogen sulfide and potassium chloride.
00:13
To balance it, we need to put a two in front of the hcl, so we have our two hydrogens that gave us two chloride, so we need to put a two in front of the kcl, that gave us two potassiums, but we have two potassiums.
00:26
Here's the balanced chemical reaction.
00:27
To calculate the moles of h2s, which is what is required before we can calculate its mass, we'll take the pressure that is provided at 752 tor, divide by 760 in order to get atmospheres, so we can use the ideal gas law, multiply that by r, sorry, multiply that by the volume.
00:53
The volume of 42 .9 milliliters is 0 .0 -429 liters.
00:59
So n is equal to pv divided by r .0 .08206 and temperature 25 .8 degrees celsius plus 273 .15 gives us our kelvin temperature...